Great Performance from the headphones BUT
Many years of experience with a variety of high performance audio gear and headphones. I am satisfied with the overall sound quality but also agree on on the weakness of app as pointed out in other reviews. However there is one other thing that I suspect is because of a mismatch in what the iPhone software thinks the headphone volume is versus actual sound being produced. I am getting constant IOS reminders that the headphones levels are too loud for safe listening. In reality the volume is set to maximum just to be able to get a moderately loud enough listening level.